Steam generator



March 25 1924.A v

s. H. LPEZ STEAM GENERATOR Filed June '7, 1923 6 Sheets-Sheet 1 ATTRNEY.

, STEAM GENERATOR Filed June 7 I 1923 March 25 1924.

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s. H. LPEZ lSTEAM GENERATOR Filed June '7 1923 6 SheetsjShee't 3 INVENIOR.

rreJolzpez) rie March 25 1924.

s. H. LPEZ STEAM GENERATOR Filed June '7, 1923 6 Sheevts-Sheet 4' "mer'r'g/dzalpez, INVENTOR.

ATTORNEY.

March 25 1924.

s. H. LPEZ STEAM GENERATOR Filed June '7. 1925 6 Sheets-Sheet 6 Patented Mar. 25, 1924.

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SALVADOR HERREJN Lrnz, or MEXIGO, Mexico.

STEAM GENERATOR.

Application filed June 7, 1923. Serial No. 643,972.

To all LU/1.0my t may concern.'

Be it known that I, SALVADOR HERREJN Lrnz, a citizen of Mexico, residing at Mexico city, Mexico, have invented certain new and useful Improvements in Steam Generators, of which the followingl is a specification. v

This invention relates to a steam generator for use in connection with any purposes for which it is found applicable, and has for its object the provision, in a manner as hereinafter set forth, of a steam generator including means for providing, by compression, during the operation of the generator continuous internal combustion of maximum eiciency for steam generating purposes whereby the generation Iof steam is greatly facilitated and obtained at a material saving in fuel consumption, as well as the cost of the latter.

Further objects of the invention are to provide a steam generator', which is simple in its construction and arrangement, strong, durable, compact, thoroughly eficient and convenient in its use, readily assembled and comparatively inexpensive to set up.

I'Vith the foregoing and other objects in view, the invention consists of the novel construction, combination and arrangement of parts, as hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown an embodimentof the invention, but it is to be understood that changes, variations and modifications can be resorted to which come within the scope of the claims hereunto appended.

In the drawings wherein like reference characters denote corresponding parts throughout the. several views Figure 1 is a longitudinal sectional view of a steam generator, in accordance with this invention, showing the same, by way of example, set up with respect to a locomotive of the steam type.

Figure 2 is an enlarged longitudinal-sectional view -of the combustion chamber of the generator. Y Y l Figure 3 is a horizontal sectional view on line 3 3, Figure 2. A

Figure et is-a section on line 4.-4, Figure l.

Figure 5 is a vsection on line 5 5, Figure 1. l v 1.

Figure 6 is an end View showing the valve closure.l

is a section on line 7 7, Fig- Figure 8 is a section on line 8 8, Figure 3.

Figure 9 is a section on line 9 9, Figure 8.

' Figure 10 is a perspective view of an end closure plate. v

Figure 11 is a perspective view illustrating an air distributing plate and its lower support.

Figure 12 is a perspective View of fan end support for an air distributing plate looking towards one end thereof, and Figure 13 is a like view of said support looking towards the other end thereof.

Figure 14 is a section on line lil-14, Fig.

ure 4.

Figure 15 is a fragmentary perspective view of one of the upper intermediate supports for an vair distributing pla-te.

By way of example, a steam generator in accordance with this invention, is shown set up in connection with a locomotive of the steam type, and with a generator disposed horizontally, but it is to be understood that the generator is adapted for use in connection with any character of apparatus, system or other device which requires in connection therewith the generation of steam, and it is also to be understood that the generator can be set up in connection with a portable or movable or fixed apparatus, system or device and that the positionA of the generator can be horizontal or vertical, as the circumstances require for the application of the generator with respect to the apparatus, system or device with which it is to be employed.

A steam generator in accordance with this invention, comprises a combustion unit, a ca-lefaction unit, a fuel supply unit and an air compressing unit. The combustion unit opens into the calefaction unit, the fuel supply unit opens into the rear of the combustion unit, and the compressed air unit communicates with the combustion unit.

In the embodiment of the invention, as

illustrated, the adaptation of the invention is shown in connection with a locomotive of the steam type and the calefactionunitis shown disposed horizontally and the combustion unit extending` forwardly and downwardly at an inclina-tion with respect to the calefaction unit.

`Referring to the drawings in detail, 1 (denotes the body portion of a locomotive, or rather a shell and-within which is arranged the calefaction and combustion units. rPhe calefaction unit which is the boiler element of the generator comprises a casing 2 forming a water space 3, and Vsaid casing 2 has connected therewith, as well as opening into the water space 3, a dome 4 for dry steam. Securedwithin the casing 2, are plates 5 and 6, the former arranged forwardly and the latter rearwardly with respect to the water space 3, and the said plates 5, 6, are substantially spaced from each other and each of said plates 5, 6, is formed with apertures into which extend the ends of the calefaction or boiler tubes 7. rlhe tubes 7 are spaced closer to the bottom of the casing 2 than to the top thereof, and the portion of the plate 5 which extends from the tubes 7 is imperforate, but the portion of the plate 6 which extends from the tubes 7 is provided with perforations 8. later is supplied to the space 3 by the feed tube 9. rlhe casing 2 is extended rearwardly from the plate 6, as indicated at 10, and with a vpart of said rearwardly extending portion disposed downwardly at an inclination, as at 11. The inner end of the casing 2 is formed throughout with an inwardly extending flange 12, which abuts against a conoidalshaped casing 13, secured to and extending rearwardly from the plate 6, and said casing 13 is spaced fromthe extension 10, and in connection with the latter, as well as the flange 12, provides a water space 14 which communicates with the water space 3, through the medium of the perforations 8.

The casing 2 is extended forwardly from the plate 5, as at 15, and is provided with a j closed front 16 which in connection withthe extended portion 15 and plate 5 forms an outlet chamber 17, having a stack 18 opening into the top thereof. Arranged within the chamber 17, is a colloidal-shaped tube 19 forming a draft flue, and opening into the bottom of the chamber 17 is a steam blowing element 2O for the purpose of creating a. draft through the chamber 17, tube 19 and stack 18, when the generator operates by suction on the initial starting thereof. The elements 18, 19 and 2O are of known construction in locomotives of the steam type.

The combustion unit comprises a cylindrical casing 21, which is shown in Figure 1 as disposed at an inclination, and has its forward end abutting against the casing 13, as well as opening` into the conducting flue 22, formed by the casing 13. The casing 21 forms a combustion chamber 23 provided with a segment-shaped arch 24 of refractor Y. material. The bottom of the chamber 23 is formed with a segment-shaped lining of refractory material 25. The arch 24 has its sides spaced from the sides of the lining 25. v

The combustion'unit further includes an Vouter casing 26, which is spaced from the form a Water space 27, with which communicates a dome 28, providing a space 29 for moist steam, and extending from the space 29, to the top of the space 14, is a steam conducting pipe 30, jacketed, as at 31.

The combustion unit further includes a pair of auxiliary casings 33, 34, the former arranged in advance of the latter and of greater length than the latter, and saidY casing 33 is secured to the casing 26, as at 35, 36, and forms in connection with the casing 26, a forward compressed air receiving chamber 37. The casing 34 is secured to the casing 26, as at 33, 39, and forms in connection'with said casing 26, a rear compressed air receiving chamber 40. The chamber 40 is of less area than the chamber 37 and is arranged rearwardly of said chamber 37. rlhe casing 33 depends from the lower portion of the casing 26, and the casing 34 is arranged in a similar manner.

The casing 21 has a tapered rear end terminal portion 41, which is spaced from the tapered rear end terminal portion 42 of the casing 26, whereby a continuation of the water space 2,7 is provided. A closure collar 43 is arranged between the termini of the end portions 41, 42, and which provides an inlet or entrance opening 44 at the rear end of the combustion unit and said inlet or entrance opening is closed in a manner as hereinafter referred to.

.fr water supply pipe 45 opens into theV water space 27 for the purpose of feeding water thereto, and said water space 27 is closed by the flange 12, to the space 14, as well as to the water space 3. Positioned against each side edge of the arch 24, as well as being detachably secured by the holdfast devices 46, to the casing 21, are two series of upper supports. As shown one series consisting ofnine and the other three in number, but such Vnumber can be increased or diminished depending upon the number of air distributing plates employed and which will be hereinafter referred to.

The outer upper support at each end of each series of the upper intermediate supports is shown in Figures 12 and 13 and the said outer support consists of an end plate 47, a top plate 49 and a side plate 50, while at the other longitudinal side edge of this support, which at this point` is thickened, there is formed therein a groove or channel 48 for rece' l'ing the side plates hereinafter referred to. The side plate 5G of said support is secured to the casing 21, and the top plate 49 abnts againstr the side of the arch 24. Each of the intermediate supports of the upper series consists of a pair of side plates 51, 52 and a top plate'53. The side plate 51 is secured to the casing 21. The top plate 49 of the end support and the top plates 53 of the intermediate supports posi' tion the channel or. grooves 54 and 48 inthe respective supports spaced from the casin021. j

lMounted against the sides ot the lining 25, 4as well as being secured to the casing 21, by the hold-fast devices 553, are two series of lower supports :tor the air distributing plates to be presently referred to, and each series of lower supports corres-pond in number to the number of supports of each series of upper supports. Each lower suprport comprises a side Yplate 56, and a bottom plate 57, formed with a vertically disposed rib 58 so positioned with respect to the plate 57 as to provide a seat 59. The ribs 58 and seats 59are arranged in alignment with the grooves 54 and 48. The ribs 58 of the lower supports are arranged in lengthwise alignment and a similar arrangement is had with respect to the seats 59. rlhe number of upper and lower supports of one series is greater than the number ot upper andrlower supports of the other series, and the intermediate supports of that series of greater number are indicated in Figure 2, at 60, and the end supports of such series at 61, 62. The upper and lower supports of the series of lesser number are indicated at 63, 64 and 65, in Figure 2.

At the outer end of each series of supports is arranged a closure member consisting of a vertically disposed plate 66 and an upright curved plate 67, which is disposed at an angle with respect to the plate 66, and which is secured to the casing 21 by a suitable holdfast device extending through apertures 68 in the plate 67. Interposed between the two series of supports is a closure member constructed in the same manner as the closure member referred to and which is indicated at 69, in Figure 9. The plates 66 of the closure members extend within the upper and lower supports or rather tit within such supports, as shown in Figure 9.

Each of the ribs 58, intermediate its ends, is provided with a notch 70 for a purpose to be presently referred to.

The upper and lower supports ot that series of greater number are adapted to maintain in a vertical position a series ot apertured air distributing plates 71, as shown in Figure 2r. The air distributing plates are six in number, but the number of such` plates depends upon the number ot' upper and lower supports ot the series. The plates 71 are constructed of .any material and each of themis formed with alug 72 which extends in the notch 70 and the loweredge of each of the. plates .71 is 'rabbeted, as at 73, to provideiortheseati-ng of the nplates l71 on the ribs 58 and seat 59, .,.Oneface of each of the plates; 71fh'as vformed.'integral therewith a :pair oflugs 74 which 'depend below the body of the, plate and engage Vagainst the ribs 58, as :shown 'in Figure 11",.andwhieh in connection with the supports 60, 61 and 62 maintain t-he plates 71 in upright position. The plates 71 are provided throughout with apertures 75, but the apertures :termed in one set ot plates 71 are staggered with respect to the apertures 7 formed in the other set of plates 71. The end plat-e ot each series ot' plates 71 has one end ra-bbeted, as at 76, while the other end is straight and thel intermediate series of plates 71 are rabbeted at both ends so as to overlap in their meet-- ing relation to each other, while the straight ends of the outer plates are engaged aga-inst the plates 66 for abutment thereagainst.

The supports 63, 64 and 65 are adapted to maintain in vertical position a set of air distributing plates 77 constructed of any material and set up in the same manner as the plates 71, with this exception, that each of the plates 77 is provided with a series of apertures of greater number, as indicated at 78, than the apertures in each of the plates 71. The apertures 78 in one set ot plates 77 are in spaced parallel rows with,I respect to the apertures in the other set of plates 77.

Arranged at each side ot the combustion chamber 23 is a pair of compressed air receiving chambers 79 and 80, the former is arranged forwardly of the latter. Each chamber 79 is formed by the casing 21, set of distributing plates 71, supports 60, 61 and 62, and a pair of closure members as well as the upper supports.

Communication is established between each chamber 79 and the compressed air receiving chamber 37 by a series of air injectors 81 which are of greater diameter than the openings 75 in the plates 71. Communication is established between the compressed air receiving chamber 40 and the chambers 8O by a series of air injectors 82 which are 'of greater diameter than the apertures 78 in the plates 77. As shown in Figure 4, upper and lower injectors 81 are provided, and as shown in Figure 5, upper and lower injectors 82 are provided.

The travel of the air through the chamber 37, injectors 81, chambers 79 and apertures 75, is shown by arrows in Figures 3 and 4, and the direction ofthe travel ot the air through chamber 40, injectors 82, chambers and apertures 78, is indicated by arrows in Figures 3 and 5.

The compressed air supply unit includes a compressor or other suitable device, as indicated at 83, and leading therefrom towards thecombustion unit, is a-conducting pipe 84, which opens into the chamber 37,

and i's provided with acont-rolling valve 85.

Leading from the conducting pipe 84 to the 'chamber 40, is a branch conducting pipe 86 provided with a controlling valve 87. rlhe rvalves v85 and 87 are manually operated. The pipe 84 has connected'th'erewith a suitable gage 88. The operative drive for the compressor is indicated at 89.

rlhe supply unit comprises a reservoir for liquid fuel and is indicated at 90 from which leads a valved feed pipe 91 which opens into a burner 92, extended through the tapered terminal end portions 41, 42 of the casings 21 and 26, and is disposed at an upward inclination. Extending from the steam space 29, to the burner 92, is a valved steam conducting pipe 93.

Forming a part of the combustion unit is a valved closure for the opening 44, and which consists of a hinged member 94, having a hinged connection at one end, as at 95, to one end of the combustion unit. The

other end of the member 94 is provided withV is a valve 98, having a universal joint connection 99 with said member 4, and said valve 98 has arranged forwardly thereof, as well as being shiftably connected therewith, a shield 100 of any suitable refractory material. The rear end of the combustion unit carries a rod 101, adapted to extend through the apertured lug 96, and mounted on said rod 101 is a nut 102, which engages the lug 96 for maintaining the valve closure in position to close the inlet or entrance opening 44. The universal joint connection 99 provides for the seating of the valve 98 for the purpose of sealing the opening 44 until the valve closure is released by the removing or shifting of the nut 102. A lock screw 103 engages with the stem 104 of the uni- Vversal joint connection 99 for locking said stem to the member 94. rlhe valve 98 is adjustably connected by the hold-fast devices 105 with the universal oint connection 99. The membei` 94 is formed with a socket 106 for the reception of the stem 104. rlhe falve 98 is shouldered, as at 107, so as to abut against the rear end of the combustion unit, as shown in Figure 7.

rlhe air compressor employed is of the centrifugal type.

rlhe continuous internal combustion is had at the combustion unit through the means of compressed air supplied by the compressor and by the compression of the liquid Vatomized fuel or pulverized fuel materials that is injected through the burner 92. When the generator is started, the valved closure is thrown open andthe fuel from the burner is projected against the arch. The controlling valves 85 and 87 are open to permit of a supply of fresh air in the desired quantity so as to provide for the ignition of the fuel. On initially starting the generator, suction is provided by opening the blower 20 and after a stream of steam is sent through the tube 19, by means of the blower 20 so as to provide a draft to obtain proper operation orrrather proper bustion and the air supplied is always atV the forward part of the foot or beginning of the flame. ly operating the generator by compression, so as to set up a continuous internal combustion, the air is driveninto the combustion chamber by thin Vcurrents that mix in an effective manner with the fuel so as to give a maximum efficiency of combustion and which can only be'obtained by providing for a thorough distribution of the air at or on the forward part'of the foot or beginning of the flame. Under such con-` ditions the fuel is easily combined with the air because ofthe high thermic temperature that it attains. K

The air distributing plates can be arranged in a different manner than that as shown on the drawings, for example, from vertical to horizontal or diagonal position, and under such arrangement'providing for effective operation as if the plates were positioned vertically, as the air distributing plates are only modified with re- .et to the form of position and not the system of the application of air, which is the injecting into the combustion chamber of thin air currents arranged parallel, or in other positions but always discharging on the forward part or foot or beginning of the flame. air injectors can be positioned to extend differently from that as shown and can be of any suitable shape, andfurthermore, the combustion unit can Ybe set up other than cylindrical. rlhe combustion gas created from the fuel in connection with the compressed air passes through the calefaction tubes where the heat from the combustion gas is absorbed by the water which surrounds the tubes, thus then furthermore, as the combustion chamber is surrounded by water, creating moist steam, the latter will be conducted into the water space 11 and will assist in the steam generation, and although the preferred embodiment of the steam generator in accordance with this invention is described and illustrated, yetit is to be understood that changes in the details of construction can be had which will fall within the light of the inif'ention as claimed.

While l have shown in the drawings and described hereinbefore the construction and arrangement of the plates and their supports, it is to -be clearly understood and is lt is also obvious that theV generating steam,

contemplated Within the scope of my invention to substitute other distributing means including tubes or lie-arrangement and disposition of these plates and their supports, therefore, l do not desire it construed that l am restricted in these particulars in the scope of my invention.

l. A steam generator comprising a boiler unit of th'c tubular type provided With a water space, a normally closed combustion unit for supplying heat to the boiler unit and including a combustion.chamber and a fuel injector burner opening into said com-V bustion chamber, said combustion unit further including means in'connection with the burner provide for continuous internal combustion under pressure Within said combustion chamber, said means including outer and inner compressed air receiving chambers having' interposed therebetween a 'Water jacket communicating with the Water space of the boiler unit, said outer chambers communicating with the inner chambers through said water jacket, said inner chambers opposing each other and closed at one side by plates provided Witn apertures for distributing compressed air into said com bustion chamber, a compressed air supply unit communicating with said means, and a fuel supply unit connected with said burner.

2. steam generator comprising a boiler unit of the tubular type provided with a water space, a normally closed combustion unit lfor supplying heat to the boiler unit and including a combustion chamber and a fuel injector burner opening into said combustion chamber, said combustion unit further including means in connection with the burner to pro-vide for continuous 'internal comb-ustion under pressure Within said combustion chamber, said means including outer and inner compressed air receiving chambers having interposed there-V between a Water jacket communicating With the Water space of the boiler unit, said outer chambers communicating With the inner chambers through said Water jacket, said inner chambers opposing each other and closed. at one side by ,plates provided with apertures for distributing compressed air into said combustion chamber, a compressed air supply unit communicating With said means, and a. fuel supply unit connected With said burner, said inner chambers arranged one in advance of the other and the plates for closing one side of the 'forward inner chambers having their apertures of great-er diameter than the apertures in the plates for closing one side of the rear inner chambers.

steam generator comprising a boiler unit including heat conducting fines surrounded by a Water space, a normally closed l 4. A steam generator comprising a boiler unit of a tubular type, a normally closed combustion unit for supplying heat to the boiler unit and including a fuel injector burner and means in connection with the burner to provide'for continuous internal combustion under compression, said means having as a part thereof opposed Water jacketed compressed air receiving chambers closed at one side by plates provided with apertures for distributing compressed air Within said combustion unit, certain of said plates having the apertures thereof' of a greater number than the number of the apertures in the yother of the plates, a com pressed air supply unit communicating with said means, and a fuel supply unit connected with said burner.

A steam generator comprising a boiler unit of a tubular type, a normally closed .combustion unit for supplying heat to the boiler unit and including a fuel injector burner and means in connection With the burner to provide for continuousv internal combustion under compression, said means having as a part thereof 4'opposed' Water jacketed compressed air Areceiving chambers closed at one lside "by plates provided with apertures for distributing compressed air Within said combustion unit, 4certain of said plates having the apertures thereof of aA greater number than the number of the apertures in the other of the plates, a compressed air supply unit communicating with said means, and a fuel supply unit connected With said burner, the apertures in certain of said plates being of greater diameter than the apertures in the other of said plates.

6. A steam generator comprising a boiler unit of the tubular type, a normally closed combustion unit for supplying heat to the boiler unit and including a combustion chamber and a fuel injector burner opening into said combustion chamber, said combustion unit further including means in connection With the burner to provide for continuous internal combustion under pressure Within said combustion chamber, said means having as a part thereof a plurality of outer and two opposed spaced sets of inner compressed air receiving chambers, a water jacket interposed between said outer and inner chambers, means extending through the water jacket for establishing communication between the outer and the inner chambers, the chambers of each of said sets of inner chambers closed at one side by plates provided with apertures for distributing compressed air into said combustion chamber, certain of said plates having the apertures thereof of greater diameter and of greater number than the number and diameter of the apertures in the other of the plates, a compressed air supply unit communicating with said means, and a fuel supply unit connected with said burner.

7. A steam generator comprising a boiler unit of the tubular type, a normally closed combustion unit for supplying heat to the boiler unit and including a combustion chamber and a fuel injector burner opening into Ysaid combustion chamber, said combustion unit further including means in connection with the burner to provide for continuous internal combustion under pressure within said combustion chamber, said means having as a part thereof a plurality of outer and two opposed spaced sets of inner compressed air receiving chambers, a water jacket interposed between said outer and inner chambers, means extending through the water jacket for establishing communication between the outer and the inner chambers, the chambers of each of said sets of inner chambers closed at one side by plates provided with apertures for distributing compressed air into said combustion chamber, certain of said plates having the apertures thereof of greater diameter and of a greater number than the number and diameter of the apertures in the other of the plates, a compressed air supply unit communicating with said means, and a fuel supply unit connected with said burner, the apertures in certain of said plates being staggered with respect to the apertures in the other of said plates. 8. A steam generator comprising a combustion unit including an inner and an outer casing arranged in spaced relation to provide a water space, said inner casing forming a combustion chamber, means connected to said inner casing to provide forward inner compressed air receiving chambers and including perforated plates for distributing air therefrom into the combustion chamber, means connected to said inner casing to provide rearward inner compressed air receiving chambers and including perforated plates for distributing the air therefrom into the combustion chamber, means connected to the outer casing to provide outer compressed air receiving chambers communicatingl with a compressed air supply, air

injectors extending across said water space and leading from the outer to the inner compressed air receiving chambers, and an injector burner extending into said combustion chamber. Y

9. A steam generator comprising a combustion unitincluding an inner and an outer casing arranged in spaced relation to provide a water space, said inner casing forming a combustion chamber, means connected to said inner casing to provide forward inner compressed air receiving chambers and including perforated plates for distributing air therefrom into the combustion chamber, means connected to said inner casing to provide rearward inner compressed air receiving chambers and including perforated plates for distributing the air therefrom into the combustion chamber, means connected to the outer casing to provide outer compressed air receiving chambers communicating with a compressed air supply, air injectors extending across said water space and leading from the outer to the inner compressed air receiving chambers, and an injector burner extending into said combustion chamber, said combustion unit formed with an entrance opening, and a hinged closure for said entrance opening, said clo- Y sure including a plate, a valve having a universal joint connection with the plate, a protecting member for and connected with the valve, and means for securing the closure in operative position.

10. A steam generator comprising a combustion unit including a-n inner and an outer casing arranged in spaced relation to provide a water space, said inner` casing forming a combustion chamber, means connected to said inner casing to provi-de forward inner compressed air receivingvchambers and including perforated plates for distributing air therefrom into the combustion chamber, means connected to said inner casing to provide rearward inner compressed air receiving chambers and includingY perforated plates for distributing the air therefrom into the combustion chamber, means connected to the outer casing to provide outer compressed air receiving chambers communicating with a compressed air supply, air injectors eX- tending across said water space and leading from the outer to the inner compressed air receiving chambers, an injector burner eX- tending into said combustion chamber, said inner compressed air receiving chambers arranged one in advance of the other said outer compressed air receiving chambersl arranged one in advance' of the other, and compressed air supply means leading from each of said outer compressed air receiving chambers.

ll. A steam generator comprising a combustion unit provided with a combustion chamber, means to provide a pair of compressed air receiving chambers within and at each side of the combustion chamber, one of the chambers of cach pair arranged in advance of the other chamber of the pair, each of the chambers of each pair provided with a perforated wall for distributing comof the chambers of each pair arranged in ad.

vance of the other chamber of the pair, each of the chambers of each pair provided with a perforated wall for distributing compressed vair in streams into the combustion chamber, means to provide a water space surrounding said combustion chamber and outer compressed air receiving chambers ar ranged exteriorly of the Water space, air injector nozzles leading from the outer compressed air receiving chambers to the compressed air receiving chambers arranged within the. combustion chamber, a fuel injector burner opening into said combustion chamber, and compressed air supply means communicating with said outer compressed air receiving chambers.

13. A steam generator comprising a combustion unit provided with a combustion chamber, means to provide a pair of 'compressed air receiving chambers within and at each side of the combustion chamber, one of the chambers of each pair arranged in advance of the other chamber of the pair, each of the chambers of each pair provided with a perforated wall for distributing compressed air in streams into the combustion chamber, an arch of refractory material positioned between the top of said pairs of air receiving chambers, a refractory lining positioned between the bottom of said pairs of said air receiving chambers, a fuel injector burner extending through said lining and directed toward said arch, air injector nozzles opening into each of said air receiving chambers, and a compressed air supply means communicating with said air injector nozzles.

14. A steam generator comprising a combustion unit provided with a combustion chamber, means to provide pair of compressed air receiving chambers within and at each side of the combustion chamber, one of the chambers of each pair arranged in advance of the other chamber of the pair, each of the chambers of each pair provided with a perforated wall for distributing compressed air in streams into the combustion chamber, an air injector nozzle opening into each of said air receiving chambers, a fuel injector nozzle opening into each of said combustion chambers, and a compressed air supply means communicating with said nozzle, the perforations in the wall of each forward chamber of a pair being of greater diameter than the perforations in the wall of each rear chamber of a pair.

15. A steam generator comprising a combustion unit provided with a combustion chamber, means to provide a pair of compressed air receiving chambers within and at each side of the combustion chamber, one of the chambers of each pair arranged in advance of the other chamber of the pair, each of the chambers of each pair provi-ded with a perforated wall for distributing compressed air in streams into the combustion chamber, an air injector nozzle opening into each of said air receiving chambers, a fuel injector nozzle opening into each of Said combustion chambers, and a compressed air supply means communicating with said nozzle, the perforations in the wall of each'forward chamber of a pair being of greater diameter than the perforations in the wall of each rear chamber of a pair, the perforations in the walls of the chamber of one pair being staggered with respect to the perforations in the walls of the chambers of the other pair.

16. A 'steam generator comprising a combustion unit provided with a combustion chamber, means within said combustion chamber to provideopposed compressed air receiving chambers each provided with a perforated wall for distributing compressed air in streams into the combustion chamber, an arch of refractory material positioned between the top of said air receiving chambers, a refractory lining positioned between the bottom of said air receiving chambers, said arch and lining forming respectively the top and bottom of said combustion chamber, air injector nozzles opening into said compressed air receiving chambers, a fuel injector burner extending up through said lining and directed toward said arch, and a compressed air supply means communicating with said air injector nozzles.

17. A steam generator comprising a combustion unit provided with a combustion chamber, means within said combustion chamber to provide opposed compressed air receiving chambers each formed with a perforated Wall for distributing compressed air in streams into the combustion chamber, an arch of refractory material arranged within the combustion chamber and positioned between the top of said compressed air receiving chambers, a refractory lining arranged within the combustion chamber and positioned between the bottoms of said air receiving chambers, means to provide a Water space surrounding said combustion chamber and further providing outer compressed air receiving chambers arranged exteriorly of -the Water space, injector nozzles leading from said outer air receiving chambers to the air receiving chambers Within the combustion chamber, a fuel injector burner extending up through said lining and directed toward said arch, and compressed air supply means communicating with said outer air receiving chambers.

18. A steam generator comprising means to provide a series of heat conducting flues surrounded by a Water space, aV conoidalshaped casing' opening` into said iues, means to provide a Water space surrounding said casing and communicating with the Water space surrounding the flues, means to provide a combustion chamber opening into said casing and formed at each side with inner compressed air receiving chambers having perforated Walls for distributing streams of compressed air into the combustion chamber, means to provide a Water space surrounding said combustion chamber and a steam conducting fine leading from said space to the yWater space surrounding said casing, means to provide outer compressed air receiving chambers exteriorly of said Water space, injector nozzles leading from said outer chamber to said inner chamber, a fuel injector burner opening into said combustion chamber, and compressed air supply means communicating With said outer chambers.

19. A steam generator comprising means to provide a series of heat conductingflues surrounded by a Water space, a conoidalshaped casing opening into said fines, means to provide a Water Space surrounding Vsaid casing and communicating With the Water space surrounding the flues, means to provi de a combustion chamber opening into said casing and formed at yeach side kwith inner compressed air receiving chambers having perforated Walls for distributing streams of compressed air into the combustion chamber, means to provide a Water space surrounding said combustion chamber and a steam conducting flue leading from said space to the Water space surrounding said casing, means to provide outer compressed air receiving chambers exteriorly of said Water space, injector nozzles leading from said outer chamber to said inner chamber, a fuel injector burner opening int-o said combustion chamber, and compressed air supply means communicating with said outer chambers, said combustion chamber provided with an entrance opening, and a valved closure for sealing said opening, said closure being hinged and provided with means for detachably securing it in sealing position.

In testimony whereof, I affix my signature hereto.

SALVADOR HERREJ N LPEZ. 

